Top IT companies are failing to provide its staff with sufficient training, according to union Unite.
A survey by Unite of 400 employees working for IT companies, such as Apple, Accenture, Atos Origin, IBM and Logica, found 62% of IT professionals felt they lacked necessary training to keep their skills up-to-date.
Only 15% of employees surveyed said they were satisfied with the training they received from their employers.
Peter Skyte, Unite national officer, said, the survey's findings were "deeply worrying".
"In such a fast moving sector, UK workers will lose out unless they can compete in a global IT market. Employers must do more to keep their employees' skills up-to-date ," said Skyte.
The survey also found employees were unhappy with predetermined distribution of performance rankings, also known as forced ranking, with 91% of employees reporting it to have a negative impact on team working.
Employees from Capita, CSC, Sony Ericsson, Everything Everywhere, Fujitsu Services, Phoenix, TCS and Unisys were also included in the survey.
Unite said it will be meeting employers to discuss ways of improving training and remuneration practices.